In this paper we report the results of our experimental work conducted to decoloration of a well-known highly toxic Amaranth dye by electrochemical and photoelectrochemical methods. Throughout this investigation were ...In this paper we report the results of our experimental work conducted to decoloration of a well-known highly toxic Amaranth dye by electrochemical and photoelectrochemical methods. Throughout this investigation were used two different Dimensional Stable Anode (DSA) electrodes, namely, IrO2-Ru2O-SnO2-TiO2/Ti and Ru2O-SnO2-TiO2/Ti. The experimental results show that IrO2-Ru2O-SnO2-TiO2/Ti electrode has higher performance on amaranth decoloration than Ru2O-SnO2-TiO2/Ti electrode, but with the disadvantage of higher energy consumption. For higher degradation of Amaranth dye with both DSA electrodes, the process was carried out via photoelectrochemical method. Our experimental results clearly shown the decrease in absorbance of all UV-Vis peaks due to the mineralization of the azo dye;also, it was noteworthy photoelectrochemical process consumes less energy under the same experimental conditions than electrochemical process. The IrO2-Ru2O-SnO2-TiO2/Ti electrode reaches a higher degradation degree of Amaranth solutions than Ru2O-SnO2-TiO2/Ti electrode using a photoelectrochemical technique.展开更多
In the paper, a hybrid gas–liquid dielectric barrier discharge(DBD) plasma system was set up to treat a methylene blue(MB) solution. The effects of the change of the carrier gas, the gas bubbling rate and different k...In the paper, a hybrid gas–liquid dielectric barrier discharge(DBD) plasma system was set up to treat a methylene blue(MB) solution. The effects of the change of the carrier gas, the gas bubbling rate and different kinds of scavenger addition, including sodium carbonate(Na_2CO_3),para benzoquinone(p-BQ), triethylenediamine and sodium dihydrogen phosphate(NaH_2PO_4),on the MB decoloration were reviewed to clarify the critical active species for the dye decoloration in the DBD plasma system. The obtained results show that higher decoloration of the MB solution could be achieved when O2 was used as the carrier gas, which could be 100% after 20 min discharge treatment, and the result confirmed the crucial effect of O_3 in the MB decoloration. Based on the experiments of the scavenger addition, it could be concluded that O_2·^- and ~1O_2 were two other important reactive oxygen species(ROS) for the MB decoloration.The results of the higher chemical oxygen demand removal and faster disappearance of the characteristic peak of the MB from the UV–vis analysis under O_2 bubbling conditions also proved the critical effect of the ROS formed by O_2 on the MB decoloration.展开更多
文摘In this paper we report the results of our experimental work conducted to decoloration of a well-known highly toxic Amaranth dye by electrochemical and photoelectrochemical methods. Throughout this investigation were used two different Dimensional Stable Anode (DSA) electrodes, namely, IrO2-Ru2O-SnO2-TiO2/Ti and Ru2O-SnO2-TiO2/Ti. The experimental results show that IrO2-Ru2O-SnO2-TiO2/Ti electrode has higher performance on amaranth decoloration than Ru2O-SnO2-TiO2/Ti electrode, but with the disadvantage of higher energy consumption. For higher degradation of Amaranth dye with both DSA electrodes, the process was carried out via photoelectrochemical method. Our experimental results clearly shown the decrease in absorbance of all UV-Vis peaks due to the mineralization of the azo dye;also, it was noteworthy photoelectrochemical process consumes less energy under the same experimental conditions than electrochemical process. The IrO2-Ru2O-SnO2-TiO2/Ti electrode reaches a higher degradation degree of Amaranth solutions than Ru2O-SnO2-TiO2/Ti electrode using a photoelectrochemical technique.
基金National Natural Science Foundation of China (No. 21876070)Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment for their support of this work。
文摘In the paper, a hybrid gas–liquid dielectric barrier discharge(DBD) plasma system was set up to treat a methylene blue(MB) solution. The effects of the change of the carrier gas, the gas bubbling rate and different kinds of scavenger addition, including sodium carbonate(Na_2CO_3),para benzoquinone(p-BQ), triethylenediamine and sodium dihydrogen phosphate(NaH_2PO_4),on the MB decoloration were reviewed to clarify the critical active species for the dye decoloration in the DBD plasma system. The obtained results show that higher decoloration of the MB solution could be achieved when O2 was used as the carrier gas, which could be 100% after 20 min discharge treatment, and the result confirmed the crucial effect of O_3 in the MB decoloration. Based on the experiments of the scavenger addition, it could be concluded that O_2·^- and ~1O_2 were two other important reactive oxygen species(ROS) for the MB decoloration.The results of the higher chemical oxygen demand removal and faster disappearance of the characteristic peak of the MB from the UV–vis analysis under O_2 bubbling conditions also proved the critical effect of the ROS formed by O_2 on the MB decoloration.